[GHC] #8558: Build xhtml and haddock only when `HADDOCK_DOCS=YES`

[GHC]

#8558: Build xhtml and haddock only when `HADDOCK_DOCS=YES`
-------------------------------------+-------------------------------------
              Reporter:  nomeata     |            Owner:
                  Type:  feature     |           Status:  closed
  request                            |        Milestone:
              Priority:  normal      |          Version:  7.6.3
             Component:  Build       |         Keywords:
  System                             |     Architecture:  Unknown/Multiple
            Resolution:  fixed       |       Difficulty:  Unknown
      Operating System:              |       Blocked By:
  Unknown/Multiple                   |  Related Tickets:
       Type of failure:              |
  None/Unknown                       |
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
-------------------------------------+-------------------------------------
Changes (by thomie):

 * status:  patch => closed
 * resolution:   => fixed


Comment:

 +1 for reducing the build time.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8558#comment:5>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler